Softing FG-200 HSE/FF, Руководство пользователя

Страница: 53 / 82

Chapter 7 - Redundancy mode
Version EN-112021-1.30.3
53
§
a loss of an H1 connection between the primary device and the entire H1 link; this may be caused by
disconnecting an H1 cable from the primary device - (4a) if LD1 acts as primary device; (4b) if LD2 acts
as primary device).
Detecting a loss of an H1 connection between the primary device and the entire H1 link requires that at
least two H1 devices have been connected to that H1 channel of the Linking Device and have appeared in
the H1 Live List before the loss of the connection occurs.
Only one of the listed faults may be present at a time. Another fault cannot be tolerated until the
redundant set has been repaired and a fully operational secondary device is available.
The following fault conditions cannot be detected and covered:
§
A loss of an H1 connection between the primary device and a subset of devices on an H1 link
§
A loss of an H1 connection between the secondary device and the entire H1 link or a subset of devices
on an H1 link.
The conditions for a switch-over from the primary device to the secondary device are listed below.
Transfer from primary device to secondary device
The primary device transfers its role to the secondary device
if Host system or configuration tool request to transfer the role
or the primary device detects a failure of its own Ethernet port
or the primary device detects a failure on at least one H1 interface
or the primary device detects a loss of the connection to all devices on an H1 link. 1
1 This requires that at least two devices have been connected to that H1 channel of the Linking Device and have
appeared in the H1 Live List before the loss of the connection occurs.
The secondary device accepts the transfer
if its H1 interfaces are operational and faultless
and
its Ethernet port is operational
and it has a valid configuration.
Take over of primary role
The secondary device takes over the primary role
if the serial connection to the primary device is lost
and it acts as Link Active Scheduler on all configured H1 links
and its Ethernet port is operational.